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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '583552d1c9425a1db6d0d2c84be62fcadf89381dc1b196eb2f5a1c0c71975d2c' 
  AND token = 'x9H0Lt0E8TEDOop9+qH5wC/mwCTSpvEdS/Fa55Pk214=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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