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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7790c45370e5e2f05ea2f6b41cfedc64b6b7e1315c0e67f0d2a8ea54154dd63b' 
  AND token = 'iVbgmM11ZfYevZa94iG0JjIHQCzSX/vZyKM+zLu2bEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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