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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1faf125529f3845802ac32dafe74c98f311e51d21939951b5ee090110f1b0965' 
  AND token = 'WN/GLfZUwmFSd5JoI/EK8+lIFqQHSIp27FEv2kUSXZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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