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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef476666f9f49d4a715cc671f3a8673d0814ed4352e422087eb3e501f5271573' 
  AND token = 'AQDiLGO7Hy7r686rRfj2A0czgrx0anwsajKBMkCpElc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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