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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '281705e9602201fa445566d401ecac09e7d0c02a50b881e5812e91b5b3ed148c' 
  AND token = 'chN9bRICl5KQDFcQleaK/x/2xnQU5Gu/QwAem+PJLHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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