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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c671910ce545db8901ced49f4c82ef0fae7a1ca8fd6b969bfd6608909446324f' 
  AND token = 'GtUoRce5eWHuQEqFeeE1OiW+DEhjGQ8PXiIo944ddIE=' 
  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"
    }
  }
}