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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '399dca596dc6932aa51663e7ada01079936bb841c505537fb8e3457b72eb987d' 
  AND token = 'E8/MS0u3vvq+/HbaQWIv32O1+drteRePcSACc93A0HE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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