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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5febeabb56ed62d215c9fc1914e7dd72b1eb1bfe9e7904acade8ce4297407089' 
  AND token = 'QLLT+pG7kkA6FQlK+9KiAA5QYV8itYKRW094hOgHoaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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