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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6e4899c18e87db2e001760408725f7d988e1cbb7c450c78af759b13dea832a9' 
  AND token = 'cBArbET+XrN6r1LkvJle/zKivp9kZbM+Rp9cSDonQug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}