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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10735f4d7d69badd6293fb335c82632e28b78ed44acca4422cd4b772f6060bad' 
  AND token = 'v3MwQ9HJYxECrvFVZK2C8gml9E5Np62PjjgtOxHeEYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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