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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '928965a20f7c7c97bd28fde0e2f57259bcc14573234a1ea98bb273acf39f72d5' 
  AND token = 'A2PiOM0ddQ56YILNm1lbAGUhhqJlQaVX4Wb98LNbjaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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