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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '922679228c18f93a788e882b89c798858758e597931c1245a3a82c467d847853' 
  AND token = 'IWsxyE/nZi1HRnI0pb63dXxRqqqFsBKtCu2UkhneSRk=' 
  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"
    }
  }
}