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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff5971306401b2680c441680dcceb6c2e9b062d54b4f159a08249c002b0404d8' 
  AND token = 'tm6wEVlmwbk9Y30JdlJTBPFHkNNoNV58Yp0RM53z22g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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