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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08abe74acd259ef248614eb01b6bbc6b256b89b25af456a6aec1c87c3229ee8b' 
  AND token = 'jxe0YPEP+8mXjLGDR799q3wUzbiX2x87LiiGvtqL96A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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