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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e457d4b6064a6db63d18210173565e19ac595d69fae231a3c102cf1ba5d8029' 
  AND token = 'OZlWUTrin7YtSXN5L/MNWtn3J189cGyt2cRVuU/TOM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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