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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a49a74322a4edd6cfcfe39f065a7c710651a48057f9182e94b115172d6e210' 
  AND token = 'Yzmb1IYM6bUV3thJS1+i7owR3hAkMJM0E3n/Gsi45BI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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