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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e17b290b6a24511d2891fdd9a802a37fbe8ac03823e47bbb51c6dff7c9db2c2b' 
  AND token = 'hneSCMk+KNdZLrLUSC4fjkttuIqTTTYebYbz1a7Au2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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