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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33d3abb4944b1b81cc8eee8c36c7cab36a5a3ee25636be04559bea76e62b94fb' 
  AND token = '6oV5deGm/yYxzV35f+/EcP1j4itTx2SlOfQK5E1ETkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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