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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd6601063aa98ecd939a025f5217ba36cb1eda6aa828a4948761db10dc390b4b' 
  AND token = '49VcsO47/3OWZ3Zbl31FauTXPKOlK0cTF5Ed19D1wuM=' 
  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"
    }
  }
}