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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5c5e57d26cf631793bb5d56b95a46ac9b5eca4b478962a25319865812c4c2e6' 
  AND token = '8zZi+VaZd26A7oBwStTkSilns8z9LdRlg/Vepunko3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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