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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9439e76b87b5598bbe7417c423461af10c6a0d1dde4dbc5626678692b710143' 
  AND token = 'CdCbry/vMp0N/z6gvDP6BdYE8TQS8lb9O+ONc+W8gjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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