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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb851cb0792dd21ede22bca8f2d7c2e0e0c32514d6a9101ad8ffd526c0432a8b' 
  AND token = 'L8s16HSMJDJb0M+QaJRmWrcHqwsVH0AaQ5VGXaxAnTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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