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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c71da7325f056062332444bf1a654df44be45da7d470b1f4e409986edbb665db' 
  AND token = 'SqXY7fspDNvA+wVMncfr9mByp+7JWHe6og7uCoxepnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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