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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17d339ce4df305d74922f7e9ca29b5cb132526f0cf10e74bcb6e56965fc2f31b' 
  AND token = 'AFLMwZSdg4qvbsSfOKrhyMCv+t8AybWbLuxeI+5G0Zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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