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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bb1f8c47d74ce09335c21b2a96716edb4a9603d45470ea5c7d07c7d30d98634' 
  AND token = 'dwyJGF4HKSlraKxmvdf5uTK78cA8pHqHJX+bqpmCqvI=' 
  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"
    }
  }
}