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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d7142f45d03dfa8d55b4a14ba5ff6cf3c7c96611ef963d392eb2fed8c72f305' 
  AND token = 'r82x7/LIaGqHMCqUonsY69ydbylDqdtpwP7dCBaZbJQ=' 
  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"
    }
  }
}