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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0cdd6f368181f13495155c340906a8a209802d7b4e28be6de574d3c9c10236e' 
  AND token = '4bzHPtoBx4T5fJZ0pQ4zyxn9EZjZQjn+62vV6Ucp96A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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