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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc79fb24c35a7b3fe319e6d2f174e87298cc0725e99bf7d86a56e67eb8c4ba97' 
  AND token = 'l6EPQZHvoEhKtk6YDqoFs3T2ftxbu0gZs9GeRG+FFl8=' 
  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"
    }
  }
}