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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b42a6de9586f6489ea4493f535fb060170479e77fd44280b5d607c1cad0fa30' 
  AND token = 'h71Bq7Q6nvnDx0KEvywE5z0qaLqTaOfuMVVRDbZvnig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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