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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d91810fd89310a88b8e456a6f8c4918f3a9ccd1aaec84b55adb5bd616075a49' 
  AND token = '7P/ryd2J6G3p7vjOPI04R8uV5n03dRRteYWpS20H4UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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