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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30c7ee2dd36069231ba9d172598ec75b8599248279ef88222e8a2af3590bcd97' 
  AND token = 'G4Cb3pO6Pnh6OXQfQGrsCZCVOuKUz6o5WrXyXVuA3nU=' 
  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"
    }
  }
}