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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1682b41d6653e53051463b50758e992599861b329e7612a403d68429c4cd92c1' 
  AND token = '9yoomAJmE/c3fgP31y3qPtjB7W7/Y+cz9U7h1p+eDnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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