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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a4d760c7c7f1789885e944b5420512aff749741a58a1fe9ea9ff5a557cfc0c5' 
  AND token = 'UP9RIWxSDIHUXsi8CNIQtP6ifUKfquOd3B1KeSH7abA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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