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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e6d43be44d87756590a54ab96338ea70434266fc0acd176efe483073e6faa61' 
  AND token = 'F/8nSG6xy5yFwxOk5Y6XynfEaPxfAU18h1dyYcwpx2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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