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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01bd2b11f0c8fb08f820a75b21f049ecf1b6d391ef7c0530c2aa49605565443c' 
  AND token = 'O//9PvdTPqbazEuyEdbmOuMI5jNth05flYzmiev94WQ=' 
  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"
    }
  }
}