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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7036c8f02af4311da7a47b91a285b2ae7631c4baa433f32b19c40916d306d90' 
  AND token = '4LCjsdPAM9zJBzT+ER2wiilBUOkkCLEuL3P3tNAE3uk=' 
  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"
    }
  }
}