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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dd2e69d8b55db790824f8d77dba04d5b4af83d90dbfd17f063b5e554baa0172' 
  AND token = '9cBxchsfJjdyqbK03NZUSsAauTu4jHXarJRl7wHf/D0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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