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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '965e00b517e303136639e984ff02fe0a9f81f5b0dd374d59bb9c7d288222dedf' 
  AND token = 'Gi1ijdwUe8GpXcaEAO17vZHneiPRtTERqTVxQUJQAXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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