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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78fddae6bf80fea0de1ebd94f78066b823de03b415b48a680728450fed9f2987' 
  AND token = '9LllJ9WdLbEhq490e5Vct2sVeIBdf9mVX1q3aR+wQR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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